So I'm due to finish my new build, however am yet to cut the steerer. Now I have a dilema. If I cut it to length with 5mm spacer above stem, when I come to upgrade Stem/headset down the line (I intend to), what happens if they are too large to allow said 5mm spacer? Should I stick a 10mm/2x5mms or 5+3mm on for now?

I'd explore the market and and see how your current stem's stack height compares with other options out there. If you are on the large side, you probably don't need to leave tons of extra space. If you're on the small side, leave some room.

Having said that, when in doubt leave extra space. You can always cut it shorter later. Going the other way can be an expensive proposition.

Yeah, if you know you'll be changing stems, then dealing with some extra steerer tube sticking out for a while seems like the best plan. Stack height can vary a fair bit. For example, there's about a 5mm difference between Thomson (36.07) and Enve (41). So leaving 10 now could potentially leave you with 5 down the road. If you *really* don't know what stem you'll be moving to, you might consider leaving more than 10, just to be extra safe.

Sounds like you're being a little too financial responsible. Joking aside do you know what stem you eventually want to get? If so find out the stack height and then go from there. If you don't pick the one you will eventual get and find out the stack height.

In addition, a point that has been missed is allowance for headset. If I change my headset down the line could it not alter the amount of available steerer? I know literally nothing about headsets so I'm at a loss with this one.

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